6-5. Ic Pin Function Description - Sony XR-4750RDS Service Manual

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6-5. IC PIN FUNCTION DESCRIPTION

• MAIN BOARD IC501 MN1884820S4G (XR-4750RDS), MN1886426S4H (XR-C450RDS) (SYSTEM CONTROLLER)
Pin No. Pin Name
1 TUNMUT
2 AMPON
3 ILLON
4 PW ON
5 AMPMUT
6 RC IN1
7 VDD
8 X IN
9 X OUT
10 GND
11 XT IN
12 XT OUT
13 EX2
14 RESET
15 RDSCKI
16 BU IN
TE 17 KEYACK
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18 VOLSO
19 VOLCKO
20 VOLCE
21 TAPMUT
22 LM LOD
23 LM EJ
24 AMSON
25 N ROUT
26 AMSIN
27 PLLSO
28 PLLCKO
29 PLLCE
30 RDSSI
31 AD ON
32 DOLON
33 MTLON
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34 CM ON
35 TAPON
36 ACCON
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37 PLLSI
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I/O
O Tuner muting control pin At muting: "H"
O Power amp power supply control pin
Illumination power supply control pin
O At PW SEL on: ACC on: "H"
At PW SEL off: Power on: "H"
O System power supply control pin
O Power amp muting control pin At muting: "L"
I Rotary remote commander input pin (A/D input)
– Power supply
I Main system clock input pin (8 MHz)
O Main system clock output pin (8 MHz)
– GND
I Sub system clock input pin (32.768 kHz)
O Sub system clock output pin (32.768 kHz)
– Connected to GND
I Reset input pin
I RDS clock input pin
I Back up power supply detection pin
O Key acknowledge signal input pin
O Data output pin to electrical volume
O Clock output pin to electrical volume
O Chip enable output pin to electrical volume
O Tape muting control pin At muting: "H"
O Loading motor control pin (loadig direction)
O Loading motor control pin (eject direction)
O At AMS: "L"
O Forward/reverse control pin
I Tape music with/without detection pin "L": with music
O PLL data output pin
O PLL clock output pin
O PLL chip enable output pin
I RDS data input pin
O Power supply control pin for A/D conversion
DOLBY control input/output pin (Fixed at "H" in this set)
I/O At initial mode: valid/invalid selection input of DOLBY function
At normal mode: DOLBY on/off output
METAL control input/output pin
I/O At initial mode: valid/invalid selection input of METAL function
At normal mode: METAL on/off output "H": on
O Capstan motor control pin
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O Tape power supply control pin
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I Accessory voltage detection pin
i
I PLL data input pin
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